CVE-2021-47324
published 2024-05-21CVE-2021-47324: In the Linux kernel, the following vulnerability has been resolved: watchdog: Fix possible use-after-free in wdt_startup() This module's remove path calls…
PriorityP349high8.8CVSS 3.1
AVNACLPRLUINSUCHIHAH
EPSS
1.16%
63.6th percentile
In the Linux kernel, the following vulnerability has been resolved:
watchdog: Fix possible use-after-free in wdt_startup()
This module's remove path calls del_timer(). However, that function
does not wait until the timer handler finishes. This means that the
timer handler may still be running after the driver's remove function
has finished, which would result in a use-after-free.
Fix by calling del_timer_sync(), which makes sure the timer handler
has finished, and unable to re-schedule itself.
Affected
25 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 5.14.6-1 (bookworm) | linux 5.14.6-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 63a3dc24bd053792f84cb4eef0168b1266202a02 | 63a3dc24bd053792f84cb4eef0168b1266202a02 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 862f2b5a7c38762ac9e369daefbf361a91aca685 | 862f2b5a7c38762ac9e369daefbf361a91aca685 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0ac50a76cf3cd63db000648b3b19f3f98b8aaa76 | 0ac50a76cf3cd63db000648b3b19f3f98b8aaa76 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < dc9403097be52d57a5c9c35efa9be79d166a78af | dc9403097be52d57a5c9c35efa9be79d166a78af |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 146cc288fb80c662c9c35e7bc58325d1ac0a7875 | 146cc288fb80c662c9c35e7bc58325d1ac0a7875 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a397cb4576fc2fc802562418b3a50b8f67d60d31 | a397cb4576fc2fc802562418b3a50b8f67d60d31 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b4ebf4a4692e84163a69444c70ad515de06e2259 | b4ebf4a4692e84163a69444c70ad515de06e2259 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8adbbe6c86bb13e14f8a19e036ae5f4f5661fd90 | 8adbbe6c86bb13e14f8a19e036ae5f4f5661fd90 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c08a6b31e4917034f0ed0cb457c3bb209576f542 | c08a6b31e4917034f0ed0cb457c3bb209576f542 |
| linux | linux_kernel | < 4.4.276 | 4.4.276 |
| linux | linux_kernel | >= 0 < 5.10.70-1 | 5.10.70-1 |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
| linux | linux_kernel | >= 4.10 < 4.14.240 | 4.14.240 |
| linux | linux_kernel | >= 4.15 < 4.19.198 | 4.19.198 |
| linux | linux_kernel | >= 4.20 < 5.4.134 | 5.4.134 |
| linux | linux_kernel | >= 4.5 < 4.9.276 | 4.9.276 |
| linux | linux_kernel | >= 5.11 < 5.12.19 | 5.12.19 |
| linux | linux_kernel | >= 5.13 < 5.13.4 | 5.13.4 |
| linux | linux_kernel | >= 5.5 < 5.10.52 | 5.10.52 |
| msrc | azl3_kernel_6.6.82.1-1_on_azure_linux_3.0 | — | — |
| msrc | cbl2_kernel_5.15.176.3-3_on_cbl_mariner_2.0 | — | — |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv8.8HIGH
vendor_debian8.8HIGH
vendor_msrc8.8HIGH
vendor_redhat8.8HIGH
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Red Hat
kernel: watchdog: Fix possible use-after-free in wdt_startup()
vendor_redhat·2024-05-21·CVSS 8.8
CVE-2021-47324 [HIGH] CWE-416 kernel: watchdog: Fix possible use-after-free in wdt_startup()
kernel: watchdog: Fix possible use-after-free in wdt_startup()
In the Linux kernel, the following vulnerability has been resolved:
watchdog: Fix possible use-after-free in wdt_startup()
This module's remove path calls del_timer(). However, that function
does not wait until the timer handler finishes. This means that the
timer handler may still be running after the driver's remove function
has finished, which would result in a use-after-free.
Fix by calling del_timer_sync(), which makes sure the timer handler
has finished, and unable to re-schedule itself.
A vulnerability was found in the Linux kernel's watchdog module in the wdt_startup() function. This issue occurs when the module's remove process calls del_timer(), which does not wait for the timer handler to finish. As a result, the h
Microsoft
watchdog: Fix possible use-after-free in wdt_startup()
vendor_msrc·2024-05-14·CVSS 8.8
CVE-2021-47324 [HIGH] CWE-416 watchdog: Fix possible use-after-free in wdt_startup()
watchdog: Fix possible use-after-free in wdt_startup()
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
Linux: Linux
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: https://learn.
Debian
CVE-2021-47324: linux - In the Linux kernel, the following vulnerability has been resolved: watchdog: F...
vendor_debian·2021·CVSS 8.8
CVE-2021-47324 [HIGH] CVE-2021-47324: linux - In the Linux kernel, the following vulnerability has been resolved: watchdog: F...
In the Linux kernel, the following vulnerability has been resolved: watchdog: Fix possible use-after-free in wdt_startup() This module's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.
Scope: local
bookworm: resolved (fixed in 5.14.6-1)
bullseye: resolved (fixed in 5.10.70-1)
forky: resolved (fixed in 5.14.6-1)
sid: resolved (fixed in 5.14.6-1)
trixie: resolved (fixed in 5.14.6-1)
OSV
CVE-2021-47324: In the Linux kernel, the following vulnerability has been resolved: watchdog: Fix possible use-after-free in wdt_startup() This module's remove path c
osv·2024-05-21·CVSS 8.8
CVE-2021-47324 [HIGH] CVE-2021-47324: In the Linux kernel, the following vulnerability has been resolved: watchdog: Fix possible use-after-free in wdt_startup() This module's remove path c
In the Linux kernel, the following vulnerability has been resolved: watchdog: Fix possible use-after-free in wdt_startup() This module's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.
GHSA
GHSA-fpq3-4hc6-6rvg: In the Linux kernel, the following vulnerability has been resolved:
watchdog: Fix possible use-after-free in wdt_startup()
This module's remove path
ghsa_unreviewed·2024-05-21
CVE-2021-47324 [HIGH] CWE-416 GHSA-fpq3-4hc6-6rvg: In the Linux kernel, the following vulnerability has been resolved:
watchdog: Fix possible use-after-free in wdt_startup()
This module's remove path
In the Linux kernel, the following vulnerability has been resolved:
watchdog: Fix possible use-after-free in wdt_startup()
This module's remove path calls del_timer(). However, that function
does not wait until the timer handler finishes. This means that the
timer handler may still be running after the driver's remove function
has finished, which would result in a use-after-free.
Fix by calling del_timer_sync(), which makes sure the timer handler
has finished, and unable to re-schedule itself.
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/0ac50a76cf3cd63db000648b3b19f3f98b8aaa76https://git.kernel.org/stable/c/146cc288fb80c662c9c35e7bc58325d1ac0a7875https://git.kernel.org/stable/c/63a3dc24bd053792f84cb4eef0168b1266202a02https://git.kernel.org/stable/c/862f2b5a7c38762ac9e369daefbf361a91aca685https://git.kernel.org/stable/c/8adbbe6c86bb13e14f8a19e036ae5f4f5661fd90https://git.kernel.org/stable/c/a397cb4576fc2fc802562418b3a50b8f67d60d31https://git.kernel.org/stable/c/b4ebf4a4692e84163a69444c70ad515de06e2259https://git.kernel.org/stable/c/c08a6b31e4917034f0ed0cb457c3bb209576f542https://git.kernel.org/stable/c/dc9403097be52d57a5c9c35efa9be79d166a78afhttps://git.kernel.org/stable/c/0ac50a76cf3cd63db000648b3b19f3f98b8aaa76https://git.kernel.org/stable/c/146cc288fb80c662c9c35e7bc58325d1ac0a7875https://git.kernel.org/stable/c/63a3dc24bd053792f84cb4eef0168b1266202a02https://git.kernel.org/stable/c/862f2b5a7c38762ac9e369daefbf361a91aca685https://git.kernel.org/stable/c/8adbbe6c86bb13e14f8a19e036ae5f4f5661fd90https://git.kernel.org/stable/c/a397cb4576fc2fc802562418b3a50b8f67d60d31https://git.kernel.org/stable/c/b4ebf4a4692e84163a69444c70ad515de06e2259https://git.kernel.org/stable/c/c08a6b31e4917034f0ed0cb457c3bb209576f542https://git.kernel.org/stable/c/dc9403097be52d57a5c9c35efa9be79d166a78af
2024-05-21
Published